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Fluorescence molecular tomography resolves protease activity in vivo.

Vasilis Ntziachristos1, Ching-Hsuan Tung, Christoph Bremer

  • 1Center for Molecular Imaging Research, Massachusetts General Hospital and Harvard Medical School, Charlestown, Massachusetts, USA. vasilis@helix.mgh.harvard.edu

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Researchers developed a novel in vivo molecular sensing technology using near-infrared fluorescent probes to image protease activity in deep tissues. This method accurately visualizes enzyme activity, aiding in disease diagnosis and drug monitoring.

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Area of Science:

  • Biomedical Engineering
  • Molecular Imaging
  • Optical Diagnostics

Background:

  • Developing in vivo molecular sensing technologies is crucial for understanding biological processes within intact organisms.
  • Current methods face challenges in accurately detecting molecular targets deep within tissues.

Purpose of the Study:

  • To develop and validate a novel three-dimensional (3D) in vivo imaging technique for molecular sensing.
  • To demonstrate the capability of detecting protease activity in orthotopic gliomas using enzyme-activatable fluorochromes.

Main Methods:

  • Utilized near-infrared fluorescent molecular beacons for targeted sensing.
  • Employed tomographic inversion techniques accounting for photon diffusion in tissues.
  • Developed enzyme-activatable fluorochromes for molecular detection.

Main Results:

  • Achieved high positional accuracy in detecting molecular beacons in deep tissues.
  • Successfully resolved molecular specificities of different beacons towards target enzymes.
  • Demonstrated a linear relationship between beacon activation tomography and enzyme concentration.

Conclusions:

  • The developed tomographic imaging method enables precise 3D in vivo molecular sensing.
  • This technology can resolve enzyme activity and concentration, offering new diagnostic and therapeutic monitoring capabilities.
  • Potential applications include multispectral imaging for molecular expression patterns and continuous drug efficacy monitoring.